gratuitously
 (ad.)免費地;無故地


 Gra·tu·i·tous a.
 1. Given without an equivalent or recompense; conferred without valuable consideration; granted without pay, or without claim or merit; not required by justice.
    We mistake the gratuitous blessings of Heaven for the fruits of our own industry.   --L'Estrange.
 2. Not called for by the circumstances; without reason, cause, or proof; adopted or asserted without any good ground; as, a gratuitous assumption.
    Acts of gratuitous self-humiliation.   --De Quincye.
 -- Gra*tu*i*tous*ly, adv. -- Gra*tu*i*tous*ness, n.

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 gratuitously
      adv : in an uncalled-for manner; "he insulted us gratuitously"